Pneumatic weft detector for looms



Dec. 28 1926.

W. H. WAKEFIELD- i PNEUMATIC WEFT DETECTOR FOR LOOMS v Filed sept. 26,1925 Patented Dec. 28, 1926.

Lljtdl frcs atar WALTER WAKEFEELD, GF WORCESTER, MAElSCHSETTS, ASSGNORTO CROIVIPIN t KIII'OWLES LOOM "WQRKS, 0F WORCESTER, IASSACSETTS, ACQBPOEATION F MASSACHUSETTS.

PNEUMATC HEFT DETECTOR FOR LOOMS.

Application filed September This invention relates to pn-eun'iatic Wettdetectors for Wett replenishing looms and it is the general object ofthe invention to provide such a detector employing a blast oit air to bedirected against the yarn but prevented from actuating a controller solong as suthcient yarn is present.

@n very line yarn such as silk it is found that the supply oi Wett laststor soV long a Jrime that any of the usual types ot detectors whichstrike the yarn will abrade the latter with resulting breakages. 1n'co-pending application, Seria-l No. 57,916 there is shown a pneumaticeeler employing a blast ot air cooperating with a bobb'in having a slottherethrough Which is in alignment with the air projector and theindicating controller. 1n said applicati-on it is necessaryito providemeans for placing` the 1oohloin with the slot horizontal, a conditionwhich requires employment ot additional mech anism in connection Withthe transterrer arm.

a further object of my invention to obviate the need ot special transfermechanism by employing` a Wett detector ot the general type set Yforthin said application with a bohbin having perforations therein soarranged that it may be placed in the shuttle in any angular position,-sulicicient air passing through one or more of the openings to actuatethe cont-roller.

'Vtlith these and other objects in view which will appear as thedescription proceeds my invention resides in the combination andarrangement of parts hereinafter described and set 'forth in the claims.

1n the accompanying drawings wherein a convenient embodiment of myinvention is shown.y

llig. 1 is a top plan view oit a detector made according to my presentinvention,

showing the same associated with a sl'iuttle ha ing portions in section.

Fige. sind S are v xrtical sections on lines 22 und fl-?,, respectively,ot Fig. 1,

ft is a viev: similar to 2 but showing tue parts moved to indicatingposition,

553 an enlarge-:l .transverse section through a hobbin associated withmy de lecto-, and

6 is a iliagrammatic development of the surface et the hobbin.

Referring moreparticularlyvto the draw- 2c, 192,5. sei-iai no. tarea.

ings it Will be seen that l have provided a lay 10 which moves hack andforth in a loom trame 11. A stand 12 secu "ed to and extending laterallyfrom the loom trame 11 has guided tor vertical motion therein a block 13Which is reciprocated by mechanism not shoivn. Pivotally mounted onAsaid block'V is an actuator lever 111 the inner en`d` of which is rpivotally connected to a Arod 15 extending to Athe replenishingmechanism and serving to set the latter when said rod isl depressed.rllhe outer endet the lever extends through a` cap 16 secured to thestand 12 and having a vertical tran,- verseslot 17 therein to receivethe lever.

Slidably mounted in said stand is a control-A ler 18 the forward end otwhich is guided in the stand 12 and has secured thereto a collar19betiveen which and the stand eX- tends a light compression sprinty 20tending to hold the controller rearwardly. The controller 18 is providedwith a depending oli'- set 21 guided by the stand 12 and provided With aslot normally lying under and in alignment with the slot 17 ot the cap.The rear end oit the controller 18 has secured thereto a broadened cup23 whi ch is adapted to extend through a slot 211 formed in the binder Band shuttle S. The actuator may be provided with a notch 25 and thelower edge of the actuator lever 141 may be inclined to tit the notch.

So long as sui'licient yarn tor continued Weaving is present the lever1e will move up and down in the aligned slots 17 and 22 as the loloclr13 reciprocates but at the time o:l Wett exhaustion the controller 18Will be moved forwardly until the notch 25 lies under the lever 14 atWhich time descent ot the latter is prevented and indication is given tothe replenishing mechanism. With the exception of the cup 23 and theparticular torni oi controller 18? the matterthus tar describecl issubstantially the same as the mechanism Set forth in Patent No. 1,030,1'e8.

In carrying out my improvements 1 pros vide the lay with a box baclr 370having a long and narrow slot 31 therein in which is securedl thecorrespondingly formed upper horizontal mouth 32 of an air nozzle 33.The latter is secured tothe upper end of a flexible hose 3e Which mayhave projecting therethrough by means of mechanism set ico CII

V forth in Patents Nos. 1,220,685 and 1,337,706.

The britt ot' the bobbin is held in place by the usual springs 36cooperating` with the rings 53'? and said hobbin is provided With abarrel which may be either conical or cylindrical. rthe barrel hasextending therethrough a series ot holes 39 which are arranged in spacedparallel planes perpendicular to and cutting' across the axis ot thebohbin at equally spaced points. As shown herein sir; holes .arearranged in three spaced groups et two each. andthe groups are staggeredangularl7 with respect to each other so that angT plane passing throughthe oLt the bobhin Will cut through at least one hole, irrespective otthe angular position ot'V the hobhin.

Referring to Fie' 6 Where 130th ends of the openings are hou'ndiagrannnatically, l have shown a rectangular area et() enclosed indotted lines and representing; the cross section ot the blast of airwhich issues troni the inouth against the bohbin. lt will he seen thatsaid area u'ill embrace parts ol at least two ol' the opening-s 39 andas the openings are aligned in pairs it will be seen that the blast otair issuing,` lfroin the mouth Sii will be able to pass through one orincre ot the openings and he projected against cup 223.

Under norinal conditions presence ot suitieient Wett will deflect theblast o't air as indicated by the arrows in Fig. 2 so that cup will beunaffected and lever le will be iree to more downwardly in slot 22, hutat the tiine oi substantial enhausti n of wett the holes 3S will beuncovered and air will p through one or more ot thorn, aud through thetrout shuttle Wall and pass on to the cup 23 to'inore the latterforwardly thus moving' slot out ot` alignment with lever l-/l to gite anindi ation o'l' Weit e3;- haustion previously described. Beterence to''l will shou' that the cup 2&3 is slightlj,Y wider than the perforatedpart ot the b" 'el hohhiu and that the rnouth is sui'iiciertljl,VY Wideto have air issuing` theretroni pass through at least one hole when theshuttle properlyv placed. lt is to he understood that the blast oi airissues 'troni the inouth 3Q While the la;7 is on front center and thatle ver il has its operative downward niotion at this time also,

Frein the foregoing it will he seen that l have provided a pneumaticWett detector' depending' 'for its operation upon a passage ot airthrough a depleted bobbin and that the latter is so constructed as to beoperatively placed irrespective of its angular position with respect tothe shuttle.

Havingl thus described my invention it will he apparent that changes andniodications inay be made therein by those skilled in the art Withoutdeparting' troni the spirit and scope oi the invention, and l do notWish to he limited to the details herein disclosed but what l claim is:

l. ln a pneumatic Wett detector Ytor a Wett replenishingl leoni, acontroller' to indicate Wett exhaustion and oeculyingv one position whensufficient Wettis present and occupi/'ina` another position Wheninsutlieient Wett is present, said controller' having` a face responsiveto air pressure, a bobbin having a pluralitj.T or' angularly spaced airpassages extending transversely there through, and rneans to direct astream oft air against the bobbin and touard .pensive surface, saidbobbin when supplied witl icient rie-tt detlecting the air array the ilS froin the controller and said bobbin being so 'formed that When.insutlioient wett thereon air will reach the surface responf 'e to airpressure to cause said controller 'to occupy the position to indicateWett es; haustion, the hobhin being' eiiective 'to a i .t iniiuliratingl wett exhaustion in all angular positions there ic. Y

f2. Inr a uv'ett detector Ytor Wol't replenishing loon'is.y bohhinhaving u phiralitjtT ot spaced openings entendingI therethrough red withres lect to each other so that a pn le passingl through the anis ot' thehohin will cut through at least one the o and a pair ot pneuinatically,Yopera one disposed on each side or" the half bin to eiiect indication otWett efrhaufton when the openinos are suticieutlf uncover ed to permit astreani ot to troni one ot said devices to the o1! o. in a pneumaticWett detector for a rif-rt replonishing leoni, a controller to be niovedat the time ot Wett exhaustion having' a eurtace responsive to airpressure, ineans to project a streain of air toward the responsivesurface ot the controller, and a bohhin interposed between the ineensand the surtaee and provided with a plurality or' spaced openingsextending through the hob1 in and at least one ot which will he inalignment With the streain of air and the suriace relsponsiife to airpressure to allow air to pass toward and more the controller when saidopenings are uncovered b3. a substantially erthausted supply ot Wett onthe bohbin. l

ln testimoniT whereof l hare hereunto at fixed my signature.

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